From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaehoon Chung Subject: Re: [RFC] MMC-4.5 Context ID Date: Mon, 06 Feb 2012 14:26:54 +0900 Message-ID: <4F2F649E.2010106@samsung.com> References: <1328110021-15199-1-git-send-email-saugata.das@stericsson.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from mailout1.samsung.com ([203.254.224.24]:34750 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750717Ab2BFF1B (ORCPT ); Mon, 6 Feb 2012 00:27:01 -0500 Received: from epcpsbgm2.samsung.com (mailout1.samsung.com [203.254.224.24]) by mailout1.samsung.com (Oracle Communications Messaging Exchange Server 7u4-19.01 64bit (built Sep 7 2010)) with ESMTP id <0LYY007ILHSRNT30@mailout1.samsung.com> for linux-mmc@vger.kernel.org; Mon, 06 Feb 2012 14:27:00 +0900 (KST) Received: from [165.213.219.108] by mmp2.samsung.com (Oracle Communications Messaging Exchange Server 7u4-19.01 64bit (built Sep 7 2010)) with ESMTPA id <0LYY00H7NHSZO070@mmp2.samsung.com> for linux-mmc@vger.kernel.org; Mon, 06 Feb 2012 14:27:00 +0900 (KST) In-reply-to: Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Saugata Das Cc: Chris Ball , Saugata Das , linux-mmc@vger.kernel.org On 02/06/2012 02:13 PM, Saugata Das wrote: > On 5 February 2012 08:15, Chris Ball wrote: >> Hi, >> >> On Wed, Feb 01 2012, Saugata Das wrote: >>> From: Saugata Das >>> >>> This patch groups the read or write transfers to eMMC in different contexts >>> based on the block number. Transfers to consecutive blocks are grouped to a >>> common context. So several small transfers combine to give performance like >>> a large multi block transfer. >>> >>> The patch creates a context of 1MB multiple in non-large unit mode. Reliable >>> mode is enabled in the context based on whether reliable write is enabled. >> >> Do you see any performance changes with this patchset? If so, can you >> give details? > > I do not see any performance impact (positive or negative) on the > sample eMMC-4.5 device which I have. This could be due to the slow > bridge which I use (1-bit mode at 25MHz) to connect the eMMC-4.5 > device on micro-SD slot of 8500 platform. I think that should be increased the performance by how we select the context. I also didn't see any performance benefit..8-bit mode at 50Mhz. But i have interest for this feature Best Regards, Jaehoon Chung > >> >> Thanks, >> >> - Chris. >> -- >> Chris Ball >> One Laptop Per Child >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >